A.4 Counter Operations

Read/Write Operation

Before you write the initial count to each counter, you must first specify the read/write operation type, operating mode and counter type in the control byte and write the control byte to the control register [BASE + 30(Dec)].

Since the control byte register and all three counter read/write registers have separate addresses and each control byte specifies the counter it applies to (by SC1 and SC0), no instructions on the operat- ing sequence are required. Any programming sequence following the 82C54 convention is acceptable.

There are three types of counter operation: Read/load LSB, read /load MSB and read /load LSB followed by MSB. It is important that you make your read/write operations in pairs and keep track of the byte order.

Counter Read-back Command

The 82C54 counter read-back command lets you check the count value, programmed mode and current states of the OUT pin and Null Count flag of the selected counter(s). You write this command to the control word register. Format is as shown at the beginning of this section.

The read-back command can latch multiple counter output latches. Simply set the CNT bit to 0 and select the desired counter(s). This single command is functionally equivalent to multiple counter latch commands, one for each counter latched.

The read-back command can also latch status information for selected counter(s) by setting STA bit = 0. The status must be latched to be read; the status of a counter is accessed by a read from that counter. The counter status format appears at the beginning of the chapter.

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Advantech PCI-1710 user manual Counter Operations, Read/Write Operation, Counter Read-back Command
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PCI-1710 specifications

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